o mantel.test() could return P-values > 1 with the default
two-tailed test.
+ o extract.clade() sometimes shuffled some tip labels (thanks to
+ Ludovic Mallet and Mahendra Mariadassou for the fix).
+
OTHER CHANGES
o The code of yule() has been simplified and is now much faster for
big trees.
+ o The code of mantel.test() has been adjusted to be consistent
+ with common permutation tests.
+
CHANGES IN APE VERSION 2.8